Home / 428,111.06-642,172.86-203,494.55

Finding the Fourth Proportional to 428,111.06, 642,172.86 and 203,494.55

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Solution

The fourth proportional to 428,111.06, 642,172.86 and 203,494.55 is: 305,244.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,111.06 : 642,172.86 = 203,494.55 : x
  2. Step 2: Convert to fraction form
    428,111.06/642,172.86 = 203,494.55/x
  3. Step 3: Cross multiply
    428,111.06x = 642,172.86 × 203,494.55
  4. Step 4: Simplify right side
    428,111.06x = 130,678,673,957.05
  5. Step 5: Solve for x
    x = 130,678,673,957.05/428,111.06
  6. Step 6: Final answer
    x = 305,244.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.